Compounding fibre grade polyethylene terephthalate with a hyperbranched additive and studying its dyeability with a disperse dye / Marziyeh Khatibzadeh in COLORATION TECHNOLOGY, Vol. 126, N° 5 (2011)  

[article]  inCOLORATION TECHNOLOGY > Vol. 126, N° 5 (2011) . - p. 269-274 Titre : Compounding fibre grade polyethylene terephthalate with a hyperbranched additive and studying its dyeability with a disperse dye Type de document : texte imprimé Auteurs : Marziyeh Khatibzadeh, Auteur ; Mohsen Mohseni, Auteur ; Siamak Moradian, Auteur Année de publication : 2011 Article en page(s) : p. 269-274 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Chimie textile Colorants Mesures optiques Polyesteramides Polyéthylène téréphtalate Polymères ramifiés Teinture -- Fibres textiles synthétiques Index. décimale : 667.3 Teinture et impression des tissus Résumé : A hyperbranched polymer which comprised a polyesteramide structure was used to study improvements in dyeability of fibre grade polyethylene terephthalate films. The optical measurements of the dyed samples showed that, by increasing the percentages of the dendritic additive, K/S as a dye uptake parameter changed in the presence or absence of a carrier. The amount of chroma increased while the hue did not change significantly. The dyeability of the prepared samples was attributed to the decrease in glass transition temperature and the lower crystallinity of the polymer, as studied by differential scanning calorimetry. Thus, a new fibre grade polyethylene terephthalate, which is dyeable, could be obtained, with less need to use a toxic carrier compound. DOI : 10.1111/j.1478-4408.2010.00257.x En ligne : http://onlinelibrary.wiley.com/doi/10.1111/j.1478-4408.2010.00257.x/pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=10890 [article]

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Derivation of an instrumentally based geometric appearance index for the automotive industry / Fereshteh Mirjalili in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 11, N° 6 (11/2014)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 11, N° 6 (11/2014) . - p. 853-864 Titre : Derivation of an instrumentally based geometric appearance index for the automotive industry Type de document : texte imprimé Auteurs : Fereshteh Mirjalili, Auteur ; Siamak Moradian, Auteur ; Farhad Ameri, Auteur Année de publication : 2014 Article en page(s) : p. 853-864 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Automobiles -- Vernis Brillance (optique) Evaluation visuelle Imagerie (technique) Vernis -- Défauts Index. décimale : 667.9 Revêtements et enduits Résumé : In the present study, attempts were made to develop an index of geometric appearance capable of accurately predicting and quantifying the visually perceived geometric aspects of appearance of achromatic automotive finishes. To this end, three previously prepared individual scales for the three most significant geometric appearance attributes, namely specular gloss, distinctness of image (DOI), and orange peel for each of a series of metallic black, metallic gray, metallic silver, and solid white automotive finishes were utilized. The differences in each attribute were quantified visually by a panel of 16 observers, in terms of a lightness difference of an also previously prepared lightness scale. The innovative use of a common lightness scale showed that there is a surprisingly good correlation between the instrumentally measured specular gloss, DOI, and the LW parameter of the Wave scan instrument and the corresponding visually evaluated equivalents at the four investigated achromatic levels through minimizing observer errors and enhancing accuracy of the perceptibility procedure. These high accuracies made provisions for the implementation of the principle of additivity which led to the derivation of a geometric appearance index (GAI). However, before its derivation, one instrumentally measured parameter was remodeled exponentially to define an innovative parameter chosen to be named "percent absence of orange peel". The proposed GAI illustrates high correlation with visual assessments and is herewith recommended as a stand-alone index for predicting the geometric appearance of automotive finishes. Furthermore, this index together with a chromatic appearance index could form the foundation for deriving a total appearance index for the automotive industry. Note de contenu : - Preparation of appearance attribute scales - Instrumental characterization - The design common lightness scale for visual assessments DOI : 10.1007/s11998-014-9608-5 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-014-9608-5.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=22309 [article]

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Effect of color on some geometric attributes of visual appearance of non-effect coatings / Ali Mohammadalizadeh in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 17, N° 4 (07/2020)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 17, N° 4 (07/2020) . - p. 949-961 Titre : Effect of color on some geometric attributes of visual appearance of non-effect coatings Type de document : texte imprimé Auteurs : Ali Mohammadalizadeh, Auteur ; Farhad Ameri, Auteur ; Siamak Moradian, Auteur ; Fereshteh Mirjalili, Auteur Année de publication : 2020 Article en page(s) : p. 949-961 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse d'image L'analyse d'image est la reconnaissance des éléments contenus dans l'image. Il ne faut pas confondre analyse (décomposition en éléments) et traitement (action sur les composantes) de l'image. Analyse de variance En statistique, l'analyse de la variance (terme souvent abrégé par le terme anglais ANOVA : ANalysis Of VAriance) est un ensemble de modèles statistiques utilisés pour vérifier si les moyennes des groupes proviennent d'une même population. Les groupes correspondent aux modalités d'une variable qualitative (p. ex. variable : traitement; modalités : programme d'entrainement sportif, suppléments alimentaires ; placebo) et les moyennes sont calculés à partir d'une variable continue (p. ex. gain musculaire). Ce test s'applique lorsque l'on mesure une ou plusieurs variables explicatives catégorielles (appelées alors facteurs de variabilité, leurs différentes modalités étant parfois appelées "niveaux") qui ont de l'influence sur la loi d'une variable continue à expliquer. On parle d'analyse à un facteur lorsque l'analyse porte sur un modèle décrit par un seul facteur de variabilité, d'analyse à deux facteurs ou d'analyse multifactorielle sinon. (Wikipedia) Aspect peau d'orange (peinture) Brillance (optique) Couleur Evaluation visuelle Revêtements Index. décimale : 667.9 Revêtements et enduits Résumé : The aim of the present study was to investigate the effect of color attributes of appearance on the corresponding geometric attributes of appearance of non-effect coatings. Three scales, namely gloss, distinctness of image, and orange peel for three achromatic (black, gray, and white) and four chromatic (red, green, blue, and yellow) basecoats, each at varying levels, were prepared. The gloss and the distinctness of image scales had a sample with a maximum degree of gloss and distinctness of image, respectively, and the orange peel scale had a sample with a minimum degree of orange peel, which was considered to be the standard sample. The visual differences between the standard sample and those remaining in each scale were assessed by a panel of 28 observers using a prepared one-dimensional lightness scale based on the CIELAB and CIEDE2000 color difference equations. The correlations between visual and instrumental measurements of scales were checked, and instrumental performance with respect to visually assessed equivalent differences in gloss, distinctness of image, and orange peel were determined, giving STRESS (standardized residual sum of squares) values = 24.3, 11.6, and 9.7, respectively, in terms of CIELAB. ANOVA together with simple, lasso, and ridge regressions were applied to test the effect of color on the geometric attributes of appearance. The results illustrate that color attributes of appearance have no adverse significant effect on the main geometric attributes of appearance for non-effect coatings. Note de contenu : - EXPERIMENTAL : Preparation of scales - Instrumental measurements - Visual assessments - RESULTS AND DISCUSSION : Intra- and inter-observer variability - Correlation between visual and instrumental differences for each geometric scale - Influence of color on geometric attributes DOI : https://doi.org/10.1007/s11998-019-00315-1 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-019-00315-1.pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34383 [article]

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Effect of polysiloxane additives on the scratch resistance of an acrylic melamine automotive clearcoat / Bahram Ramezanzadeh in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 9, N° 2 (03/2012)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 9, N° 2 (03/2012) . - p. 203-214 Titre : Effect of polysiloxane additives on the scratch resistance of an acrylic melamine automotive clearcoat Type de document : texte imprimé Auteurs : Bahram Ramezanzadeh, Auteur ; Siamak Moradian, Auteur ; Alireza Khosravi, Auteur ; N. Tahmassebi, Auteur Année de publication : 2012 Article en page(s) : p. 203-214 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Automobiles -- Vernis Dureté (matériaux) Microscopie Microscopie électronique Résistance à l'abrasion Silicones Les silicones, ou polysiloxanes, sont des composés inorganiques formés d'une chaine silicium-oxygène (...-Si-O-Si-O-Si-O-...) sur laquelle des groupes se fixent, sur les atomes de silicium. Certains groupes organiques peuvent être utilisés pour relier entre elles plusieurs de ces chaines (...-Si-O-...). Le type le plus courant est le poly(diméthylsiloxane) linéaire ou PDMS. Le second groupe en importance de matériaux en silicone est celui des résines de silicone, formées par des oligosiloxanes ramifiés ou en forme de cage (wiki). Vernis -- Additifs Viscoélasticité Index. décimale : 667.9 Revêtements et enduits Résumé : Many attempts have been carried out to increase the scratch resistance of clearcoats using various appropriate additives. These additives may increase surface hardness or surface slippage, and/or enhance the bulk mechanical strength of the clearcoat. In the present study, the influence of various added loads of three differently structured polysiloxane additives on the scratch resistances of an acrylic melamine clearcoat was investigated. A series of analytical instruments, such as a laboratory carwash simulator, a scanning electron microscope, an optical microscope and an attenuated total reflectance Fourier transform infrared spectroscope, and others were used to compare the effects of the various added contents of polysiloxane additives on changes in the viscoelastic properties and scratch morphologies of the resultant clearcoats. The results illustrated that all polysiloxane additives improve the scratch resistance of such clearcoats, yet the optimum load varied for each individual additive. There is also a good indication that polyether-modified polysiloxanes improve scratch resistance by increasing surface hardness, while the fluorocarbon-modified polysiloxane tends to change the viscoelastic properties of the clearcoats. It was also found that scratch resistance varied linearly with Micro-Vickers’ hardness for brittle clearcoats. Note de contenu : - EXPERIMENT : Investigated paint system - Scratch test - MECHANICAL PROPERTIES : Microindentation - Tensile test - SURFACE ANALYSES : ATR-FTIR spectroscopy - Surface roughness DOI : 10.1007/s11998-010-9239-4 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-010-9239-4.pdf?pdf=button Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=14373 [article]

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Investigating changes in electrochemical properties when nano-silica is incorporated into an acrylic-based polyurethane clearcoat / Hamed Dastmalchian in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 9, N° 2 (03/2012)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 9, N° 2 (03/2012) . - p. 195-201 Titre : Investigating changes in electrochemical properties when nano-silica is incorporated into an acrylic-based polyurethane clearcoat Type de document : texte imprimé Auteurs : Hamed Dastmalchian, Auteur ; Siamak Moradian, Auteur ; Mohammad Mehdi Jalili, Auteur ; Seyed Mojtaba Mirabedini, Auteur Année de publication : 2012 Article en page(s) : p. 195-201 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Nanoparticules Nanotechnologie Polyacryliques Polyols Polyuréthanes Rhéologie Silice La silice est la forme naturelle du dioxyde de silicium (SiO2) qui entre dans la composition de nombreux minéraux. La silice existe à l'état libre sous différentes formes cristallines ou amorphes et à l'état combiné dans les silicates, les groupes SiO2 étant alors liés à d'autres atomes (Al : Aluminium, Fe : Fer, Mg : Magnésium, Ca : Calcium, Na : Sodium, K : Potassium...). Les silicates sont les constituants principaux du manteau et de l'écorce terrestre. La silice libre est également très abondante dans la nature, sous forme de quartz, de calcédoine et de terre de diatomée. La silice représente 60,6 % de la masse de la croûte terrestre continentale. Spectroscopie d'impédance électrochimique Tension superficielle Vernis -- Additifs Index. décimale : 667.9 Revêtements et enduits Résumé : Two different types of nano-silica (i.e., hydrophilic Aerosil 200 and hydrophobic Aerosil R805) were employed in the preparation of 2-pack acrylic polyol polyurethane nano-coatings so that the electrochemical properties of the resultant coatings could be investigated. Electrochemical impedance spectroscopy was used to evaluate the corrosion performances of such nano-coatings applied onto mild steel substrates that were immersed in 3.5% (w/w) NaCl solutions. It was observed coatings that contained nano-silica increased the barrier properties of the binder, as well as the coatings’ electrochemical resistance compared with pure polyurethane coatings. The surface tension of pure polyurethane was measured by a tensiometer. Rheological properties were also determined at various shear rates by a rotaviscometer. Results showed that the surface tension of hydrophobic nano-silica is very close to the pure polyurethane matrix, giving the better compatibility of the two. This was further confirmed by transmission electron microscopy and by the fact that the hydrophobically filled nano-silica coatings showed shear thinning behavior in the fluid state. Also observed was better corrosion performance of the resultant hydrophobic nano-coatings compared to coatings embedded with hydrophilic nano-silica. Note de contenu : - EXPERIMENTAL METHODS : Raw materials - Preparation of nano-coatings - Tensiometrical properties - Morphological analysis - Rheological studies - Electrochemical behavior - RESULTS AND DISCUSSION : Electrochemical behavior - Morphological observations - Rheological behavior - Electrochemical studies DOI : 10.1007/s11998-009-9222-0 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-009-9222-0.pdf?pdf=button Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=14372 [article]

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A new approach to investigate relationships between certain instrumentally measured appearance parameters and their visually perceived equivalents in the automotive industry / Fereshteh Mirjalili in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 11, N° 3 (05/2014)  

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Quantification and prediction of visually perceived specular gloss at three illumination/viewing geometries / Fereshteh Mirjalili in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 13, N° 2 (03/2016)  

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The weathering performance of acrylic melamine automotive clearcoats containing hydrophobic nanosilica / H. Yari in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 11, N° 3 (05/2014)  

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